油田开发中后期注水井不稳定试井解释新方法

Injection Wells Unstable Well Test Interpretation Methods in the Middle and Later Stage of the Development

油田开发中后期的注水井通常会受到多相流、邻井干扰的影响,目前用于注水井的试井解释方法是基于单井、单相流的渗流理论基础上发展的,对于注水井不稳定试井资料的解释具有局限性,无法准确地评价储层参数和平均地层压力。针对上述情况,建立了在多井干扰下注水井的不稳定试井解释方法,提出了采用压力变化速率与参数组合的线性关系求解渗透率、表皮系数和平均地层压力。该方法充分考虑了邻井的干扰和油水两相渗流影响,解释出的参数更加可靠。

The middle and later periods of the oilfield development injection wells are usually multiphase flow,the influence of adjacent well interference,currently used in water injection well test interpretation methods are based on single well,based on the seepage theory of single-phase flow,for the unstable water injection well test data interpretation has limitations,unable to accurately evaluate the reservoir parameters and the average formation pressure. According to the above situation,set up in the multiple well interference betting wells unstable well test interpretation method,proposed using the pressure change rate and parameter combination to solve the linear relationship between the permeability,skin factor and average formation pressure. The method fully considers the adjoining well interference and oil-water two phase flowing,explain the parameters more reliable.